Order book

Simulate a sell-side order book and calculate the cost of a final purchase as fast as possible.

Input

1,000,000 order updates on STDIN, one per line:

+ <price> <size> – add a new sell order
- <position> – delete the order at the given position
= <size> – buy <size> shares from the top of the order book

After all updates are processed, buy 1,000 shares from the top of the order book.

Output

Print the total cost of the final 1,000-share purchase to STDOUT.

Order Book Rules

Orders are sorted by price ascending (lower is better). Orders at the same price are sorted by arrival time (earlier first). Position 0 is the best (lowest-price) offer.

The = (buy) operation consumes shares starting from position 0. If an order is fully consumed, it is removed from the book.

Example

Input	Order book state
`+ 1137 100`	(1137,100)
`+ 1130 10`	(1130,10), (1137,100)
`+ 1130 50`	(1130,10), (1130,50), (1137,100)
`- 0`	(1130,50), (1137,100)
`+ 1150 200`	(1130,50), (1137,100), (1150,200)
`= 200`	(1150,150)

Total cost of the last buy: 50 * 1130 + 100 * 1137 + 50 * 1150.

Restrictions:30s256Mb 1 Score Packages

Feel free to create an issue if you need an extra library from the standard Ubuntu repository.

Name	Version	Description
libc6-dev	2.39-0ubuntu8.7	GNU C Library: Development Libraries and Header Files Contains the symlinks, headers, and object files needed to compile and link programs which use the standard C library.
libclang-common-14-dev	1:14.0.6-19build4	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-15-dev	1:15.0.7-14build3	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-16-dev	1:16.0.6-23ubuntu4	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-17-dev	1:17.0.6-9ubuntu1	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-18-dev	1:18.1.3-1ubuntu1	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-19-dev	1:19.1.1-1ubuntu1~24.04.2	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-20-dev	1:20.1.2-0ubuntu1~24.04.2	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libcrypt-dev	1:4.4.36-4build1	libcrypt development files This package contains the files needed for developing applications that use libcrypt.
libgcc-10-dev	10.5.0-4ubuntu2.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-11-dev	11.5.0-1ubuntu1~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-12-dev	12.4.0-2ubuntu1~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-13-dev	13.3.0-6ubuntu2~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-14-dev	14.2.0-4ubuntu2~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libobjc-13-dev	13.3.0-6ubuntu2~24.04.1	Runtime library for GNU Objective-C applications (development files) This package contains the headers and static library files needed to build GNU ObjC applications.
libssl-dev	3.0.13-0ubuntu3.9	Secure Sockets Layer toolkit - development files This package is part of the OpenSSL project's implementation of the SSL and TLS cryptographic protocols for secure communication over the Internet. . It contains development libraries, header files, and manpages for libssl and libcrypto.
libstdc++-10-dev	10.5.0-4ubuntu2.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-11-dev	11.5.0-1ubuntu1~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-12-dev	12.4.0-2ubuntu1~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-13-dev	13.3.0-6ubuntu2~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-14-dev	14.2.0-4ubuntu2~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libtbb-dev	2021.11.0-2ubuntu2	parallelism library for C++ - development files TBB is a library that helps you leverage multi-core processor performance without having to be a threading expert. It represents a higher-level, task-based parallelism that abstracts platform details and threading mechanism for performance and scalability. . (Note: if you are a user of the i386 architecture, i.e., 32-bit Intel or compatible hardware, this package only supports Pentium4-compatible and higher processors.) . This package includes the TBB development files.

Back to listSep 30, 2025 16:40

Wookyung JeongScore: 51,541Success

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Sep 30, 2025 16:41	48,203	52,689,015	24,963,000	2,995,000	2,359,296
2	Sep 30, 2025 16:41	48,221	55,841,341	25,971,000	1,997,000	2,449,408
3	Sep 30, 2025 16:41	48,436	54,326,967	26,087,000	2,006,000	2,375,680
4	Sep 30, 2025 16:40	48,617	49,476,559	25,177,000	3,021,000	2,375,680
5	Sep 30, 2025 16:39	48,633	55,233,019	24,178,000	4,029,000	2,490,368
6	Sep 30, 2025 16:41	49,050	55,202,055	26,417,000	2,032,000	2,301,952
7	Sep 30, 2025 16:41	49,776	57,285,128	24,888,000	3,982,000	2,502,656
8	Sep 30, 2025 16:39	49,783	57,320,897	25,887,000	2,987,000	2,379,776
9	Sep 30, 2025 16:39	49,869	51,578,537	26,930,000	1,994,000	2,519,040
10	Sep 30, 2025 16:41	49,909	55,424,886	25,953,000	2,994,000	2,387,968
11	Sep 30, 2025 16:39	49,983	51,684,029	26,991,000	1,999,000	2,301,952
12	Dec 18, 2025 05:06	50,033	57,114,054	25,017,000	4,002,000	2,408,448
13	Sep 30, 2025 16:41	50,034	54,249,895	26,018,000	3,002,000	2,310,144
14	Sep 30, 2025 16:39	50,129	54,292,634	25,065,000	4,010,000	2,355,200
15	Sep 30, 2025 16:41	50,591	54,739,909	25,296,000	4,047,000	2,510,848
16	Sep 30, 2025 16:41	50,602	52,169,238	26,313,000	3,036,000	2,326,528
17	Sep 30, 2025 16:41	50,645	59,033,420	26,336,000	3,038,000	2,330,624
18	Sep 30, 2025 16:39	51,019	53,298,176	27,551,000	2,040,000	2,502,656
19	Sep 30, 2025 16:40	51,093	59,805,854	27,591,000	2,043,000	2,478,080
20	Sep 30, 2025 16:40	51,541	59,990,886	26,905,000	2,989,000	2,285,568
21	Sep 30, 2025 16:40	51,552	60,987,166	27,907,000	1,993,000	2,510,848
22	Sep 30, 2025 16:41	51,555	55,099,258	27,909,000	1,993,000	2,420,736
23	Sep 30, 2025 16:41	51,659	54,108,448	26,966,000	2,996,000	2,351,104
24	Sep 30, 2025 16:41	51,716	55,277,028	26,996,000	2,999,000	2,404,352
25	Dec 18, 2025 05:06	51,795	52,797,952	27,037,000	3,004,000	2,494,464
26	Sep 30, 2025 16:39	51,819	54,535,060	28,052,000	2,003,000	2,482,176
27	Sep 30, 2025 16:41	51,884	51,987,743	27,084,000	3,009,000	2,314,240
28	Sep 30, 2025 16:40	51,986	57,004,356	25,127,000	5,025,000	2,355,200
29	Sep 30, 2025 16:41	52,000	51,751,503	26,139,000	4,021,000	2,494,464
30	Sep 30, 2025 16:40	52,014	52,068,720	27,152,000	3,016,000	2,465,792
31	Sep 30, 2025 16:40	52,112	51,412,727	28,210,000	2,015,000	2,457,600
32	Sep 30, 2025 16:41	52,317	50,810,393	27,310,000	3,034,000	2,314,240
33	Dec 18, 2025 05:06	52,350	60,529,613	26,315,000	4,048,000	2,502,656
34	Sep 30, 2025 16:39	52,495	52,644,673	28,418,000	2,029,000	2,392,064
35	Sep 30, 2025 16:41	52,516	53,467,347	26,398,000	4,061,000	2,265,088
36	Sep 30, 2025 16:40	52,560	54,203,254	28,453,000	2,032,000	2,306,048
37	Sep 30, 2025 16:39	53,638	57,792,148	29,103,000	2,007,000	2,506,752
38	Sep 30, 2025 16:40	53,926	55,731,731	29,260,000	2,017,000	2,453,504
39	Sep 30, 2025 16:41	54,574	56,727,577	29,611,000	2,042,000	2,404,352

Model	Intel(R) Xeon(R) CPU E3-1271 v3 @ 3.60GHz
Cores	1